I came across water injection and Aquamist full automatic system seems to be optimal solution but I failed to aquire all necessary info from FAQ/Installation guide. i have following questions:

1. how is HFS-4 connected to ECU? I already have Polar FIS box in system and anything connected to OBD doesn't work while FIS active is.

2. is EGT temps aquired from ECU? I do not wish to drill into exhaust...it would be expensive disaster at high temps I usually have

3. if connected to EGT, MAP, MAF - this system is able to control injected quantity (if I understood correctly). 60% of time I spent at cruise speed on highways and rest is alpine fun with 50-100% load

Most systems simple use MAP and injected quantity is not linear in TDi...you can have high boost, yet low injection quantity. I would like sophisticated system, which is able to adapt at any condition.

I came across water injection and Aquamist full automatic system seems to be optimal solution but I failed to aquire all necessary info from FAQ/Installation guide. i have following questions:

1. how is HFS-4 connected to ECU? I already have Polar FIS box in system and anything connected to OBD doesn't work while FIS active is.

2. is EGT temps aquired from ECU? I do not wish to drill into exhaust...it would be expensive disaster at high temps I usually have

3. if connected to EGT, MAP, MAF - this system is able to control injected quantity (if I understood correctly). 60% of time I spent at cruise speed on highways and rest is alpine fun with 50-100% load

Most systems simple use MAP and injected quantity is not linear in TDi...you can have high boost, yet low injection quantity. I would like sophisticated system, which is able to adapt at any condition.

Regards

Hajes

Apologises for not spotting this post. Hope you will revisit and read this....

Answering your questions:

1. The HFS-4 receives the PWM signal directly by tapping into the diesel injectors. Not sure what FIS is, do elaborate.

2. 0-5V EGT signal has to be acquired from a third module since the ECU does not offer it.

3. The HFS4 can operating based on two main inputs, iDC and 0-5V. Since boost is meaningless on an diesel as it is an "excess air" device, you can use the second input for EGT. Fuel rail pressure is monitored independently.